Radial drill.



No. 737,948. v PATENTED SEPT. l, 1903.

A 0. W. MUELLER-I RADIAL DRILL.

APPLICATION FILED AUG. 11. 1902.

NO MODEL.

UNTTED STATES Patented September 1, 1903.

OSCAR IV. MUELLER, OF CINCINNATI, OHIO.

RADIAL DRILL.

SPECIFICATION forming part of Letters Patent No. 737,948, datedSeptember 1, 1903.

Application filed August l1, 1902. Serial No. 119,288. (No model.)

To a/ZZ whom t muy concern:

Be it known that I, OSCAR W. MUELLER, a citizen of the United States,residing at Cincinnati, in the county of Hamilton and State of Ohio,have invented certain new and useful Improvements in Radial Drills, ofwhich the following is a full, clear,and exact description,referencebeing had to the accompanying drawings, forming part of thisspecification.

The object of my invention is to produce a drill having a non-revolublecolumn and carrying a radial arm capable of being elevated or loweredand also revolved around said co1- umn and supported by a cap-piecesuitably journaled on the upper end of said column, and this object Iobtain in a manner to be presently described.

In the accompanying drawings, Figure l is a side elevation of a radialdrill embodying my invention, some of the parts not concern ing mypresent invention being omitted. Fig. 2 is a central sectional elevationof the cap and top of the column, showing thebearing thereon. Fig. 3 isa sectional plan view on the dotted line @c of Fig. 1.

The same letters of reference are used to indicate identical parts inall the figures.

Referring to Fig. 1, A is the base-plate, of the usual or any suitableconstruction, to which is rigidly secured in any suitable manner thecylindrical column B.

C is the radial arm which carries the drilling mechanism, of the usualor any suitable construction, and which projects at right angles fromthe column B. It is provided with a split sleeve C', which surrounds andsnugly embraces the column B, so that it can be clamped tightly to thecolumn to hold the radial arm C in any of its adjusted positions or canbe unclamped therefrom to permit said arm to be swung around the columnor to be raised or lowered thereon.

.Iournaled on the top of the column B is a cap D, provided with acentral journal E for the driving-shaft and With such otherjournal-bearings F G as are necessaryin this class of machines. Betweenthe cap D and column B, I place any suitable antifriction-bearing, suchas a ball-race d, in the cap D and a similar ballrace b in the top ofthe column B,with balls c placed between the two ball-races d b to forma ball-bearing, though of course a roller-bearing or any otherantifriction-bearing would accomplish the same resultnamely, that ofallowing the cap D to revolve on the top ofthe column B with the leastpossible amount of friction.

Journaled in the cap D, as at F, is a leadscrew H, which passes througha nut I on the radial arm C and serves to raise or lower the arm C bythe revolution to right or left of the lead-screw H. This lead-screw IIcarries the weight of the radial arm C, except as will be now described.When the radial arm C is adjusted to the desired position for drilling,it is rigidly locked to the column B by hand locklevers J, working onscrew-studs j, passed through lugs e on opposite sides of the openingfin the split sleeve C of the radial arm C, as clearly shown in Fig. 3.This construction constitutes a convenient and efticient lock; but anyother suitable lock may be employed to accomplish the same purpose. The

lead-screw I-I may be geared, as shown in Fig.

1, to the driving-gear K of the machine, but may be driven by hand or inany other suitable manner without departing from the spirit of myinvention.

The drill-driving shafts L M and their connecting-gearing N O are of theusual construction and as they do not concern this invention need nofurther description.

P is any suitable cone belt-pulley for transmitting power from anysource to the drivinggear K through the medium of the vertical shaft Q,Fig. 3, passing through the central aperture in the column B andconnecting through beveled gearing with the drivingpulley P. The greatdesideratum in radial drills is to secure rigidity of the arm C, andthis I accomplish by journaling the arm C on the cylindrical rigidcolumn B, rigidly secured to the base-plate A.

It is obvious from the above description that I produce a radial drillwhich is rigid in operation, simple and easy of manipulation, and cheapin construction, for the reason that I use a rigid column and avoid thenecessity of journaling the column itself.

Having thus fully described my invention, I claiml. In a radial drill,the combination of a base-plate, a cylindrical column rigidly securedthereto, an angularly-adjustable arm roo directly journaled on saidcolumn, means for suspending said arm from the top of said column, meansfor raising or lowering said arm on said column, and means for clampingsaid arm around said column, substantially as described.

2. In a radial drill, the combination of a base-plate, a cylindricalcolumn rigidly secured thereto, an angularly-adjustable arm journaled onsaid column, a cap journaled on the' top of said column, means forsuspending said arm from said cap,.means for raising or lowering saidarm on said column, and means for clamping said arm to said column,substantially as described.

3. In a radial drill, the combination of a base-plate, a cylindricalcolumn rigidly secured thereto, an angularly-adjustable arm journaled onsaid column, a cap journaled on the top of said column,antifriction-bearings interposed between said cap and said column, meansfor suspending said radial arm from said cap, means for raising orlowering said arm on said column, and means for clamping said arm tosaid column, substantially as described.

cured thereto, an angularly-adjustable arm' journaled on said column, acap journaled on the top of said column, antifriction-bearingsinterposed between said cap and said column, a lead-screw journaled insaid cap and said arm for the purpose of suspending and raising orlowering said arm, and means for locking said arm in any adjustedposition on said column, substantially as described.

OSCAR W. MUELLER.

Witnesses: l

ALFRED R. MARSH, EDWARD PECK.

